Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2023   23:26:20   ( -70.00,   4.43) 12/25/2023   23:27:30  ( -69.97,   4.42)    3.28                70
 12/26/2023   00:17:04   (  69.88, 171.91) 12/26/2023   00:16:57  (  69.87, 171.92)    1.89                 7
 12/26/2023   01:07:42   ( -69.59, -20.33) 12/26/2023   01:06:29  ( -69.65, -20.75)   17.84                73
 12/28/2023   15:43:13   ( -69.96, 120.27) 12/28/2023   15:43:57  ( -69.95, 120.27)    1.16                44
 12/28/2023   16:33:57   (  69.84, -72.25) 12/28/2023   16:33:24  (  69.84, -72.24)    0.65                33
 12/31/2023   07:09:37   (  70.65,  67.64) 12/31/2023   07:10:45  (  70.54,  69.38)   65.62                68
 12/31/2023   08:00:07   ( -69.93,-123.91) 12/31/2023   08:00:24  ( -69.94,-123.85)    2.79                17
 12/31/2023   08:50:51   (  69.82,  43.57) 12/31/2023   08:49:51  (  69.83,  43.64)    3.09                60
 01/02/2024   23:26:19   (  70.01,-175.57) 01/02/2024   23:27:21  (  70.00,-175.51)    2.14                62
 01/03/2024   00:17:00   ( -69.86,  -8.03) 01/03/2024   00:16:52  ( -69.84,  -8.10)    3.23                 8
 01/03/2024   01:07:36   (  69.32, 160.06) 01/03/2024   01:06:25  (  69.39, 158.94)   44.88                71
 01/05/2024   15:43:12   (  69.95, -59.70) 01/05/2024   15:43:47  (  69.97, -59.66)    3.02                35
 01/05/2024   16:33:53   ( -69.80, 107.83) 01/05/2024   16:33:18  ( -69.82, 107.75)    3.33                35